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J2 Global Inc (NASDAQ:JCOM), a $3.6 billion provider of business cloud services and digital media has recently reported an activist position in Carbonite Inc (NASDAQ:CARB). According to J2 Global’s filing with the Securities and Exchange Commission, the company holds an 8.27% stake in Carbonite, which contains 2.25 million shares.

(Name,
Address and Telephone Number of Person Authorized to Receive Notices and Communications)

February 10, 2016

(Date of Event which Requires Filing of this Statement)

If the filing person has previously filed a statement on Schedule 13G to report the acquisition that is the subject of this Schedule 13D, and is filing this
schedule because of §§240.13d-1(e), 240.13d-1(f) or 240.13d-1(g), check the following box ¨.

Note: Schedules filed in paper format shall
include a signed original and five copies of the schedule, including all exhibits. See Rule 13d-7 for other parties to whom copies are to be sent.

*

The remainder of this cover page shall be filled out for a reporting persons initial filing on this form with respect to the subject class of securities, and for any subsequent amendment containing information
which would alter disclosures provided in a prior cover page.

The information required on the remainder of this cover page shall not be
deemed to be filed for the purpose of section 18 of the Securities Exchange Act of 1934 (Act) or otherwise subject to the liabilities of that section of the Act but shall be subject to all other provisions of the Act
(however, see the Notes).